PCB on Ian's Projects

BoomBay 525 and Case

Mon, 02 Jun 2025 00:00:00 +0000

A stereo speaker and amplifier for mounting in a 5.25" computer drive bay. Intended for retro-computers but could easily be used in a modern computer.

Features

3D printable 5.25" mounting case
2 x 36mm speakers
Powered by a standard “hard drive” style molex connector
Connects to your sound card’s audio out
Front volume control
Front headphone jack socket
Power LED

BOM (THT)

Qty	Component
2	1nF Mylar/Film Capacitors
2	150nF Mylar/Film Capacitors
5	100uF Electrolytic Capacitors
2	2.2uF Electrolytic Capacitors
2	470uF Electrolytic Capacitors
1	1000uF Electrolytic Capacitor
1	100nf Ceramic Capacitor
2	10KΩ Axial Resistors
2	3.9KΩ Axial Resistors
2	620Ω Axial Resistors
1	680Ω Axial Resistor
1	3mm LED
2	5-pin 3.5mm Audio Jack Sockets TN/T/RN/R/S
1	Male “Molex” connector (see BOM notes)
1	5-pin 10KΩ 16mm Thumbwheel Rotary Gear Potentiometer (see BOM notes)
1	TEA2025B 16pin DIP (or compatible)
2	36mm 8Ω Speakers (range 0.25 to 1 watt)
3	2pin Headers (2.54mm Pitch) (see BOM notes)
1	1 x Audio Cable with 3.5mm jacks at each end

“Molex” Connector
- The colloquilly named Molex connector is used for power. This connector is known by many names (eg MATE-N-LOK 350211), but is essentially the same power connector that was used on older hard disks and CD/DVD drives etc.
- The right-angled version of the Molex connector would be preferred, but straight versions are perfectly usable and easier to obtain.
- The Molex connector is not required, if you intend to power the device by the alternate dupont connector instead.
The Thumbwheel
- This is used for volume control and these components were common on many audio devices.
- It goes by various names, but ensure you get the 5pin variant with 16mm diameter gear.
2pin Headers
- The connector at J3 is intended for connecting a power source using a dupont connector. It is not required, if you intend to power the device by the molex connector instead.
- The connectors at J2 and J4 are intended for connecting the speakers via dupont connectors. They are not required if you intend to solder the speaker wires directly to the PCB.
IC sockets optional.
The thumbwheel should be mounted on the top-side of the PCB
The LED should be bent over and mounted so that the ‘bulb’ hangs just over the PCB. See the images for more context.
Although the connection polarity of the speakers doesn’t matter electrically, it does matter acoustically. Ensure both speakers use the same connection order for their wires.

JACC64-16K and Case

Mon, 02 Jun 2025 00:00:00 +0000

JACC64 16K - Just Another Commodore Cartridge 16K. A simple ROM cartridge for the Commodore 64 which takes an EPROM/EEPROM with a 16K image

Features

16K ROM
Power LED
Reset Switch

BOM (THT)

1 x 27C128 EPROM (or compatible)
1 x wide 28pin DIP socket (optional)
1 x 5MM LED
1 x 10 KOhm resistor
1 x 330 Ohm resistor
2 x 1N4148 diodes
1 x 100nF ceramic capacitor
1 x 6mm tactile switch

JACC64-512K and Case

Mon, 02 Jun 2025 00:00:00 +0000

JACC64 512K - Just Another Commodore Cartridge 512K. A ROM cartridge for the Commodore 64 which takes an EEPROM and holds 32 x 16K ROM images

Features

32 x 16K ROMs (selectable by DIP switch)
Power LED
Reset Switch

BOM (THT)

1 x SST39SF040 EEPROM (or compatible)
1 x wide 32pin DIP socket (optional)
1 x 5MM LED
6 x 10 KOhm resistor
1 x 330 Ohm resistor
2 x 1N4148 diodes
1 x 100nF ceramic capacitor
1 x 6mm tactile switch
1 x 5-Position DIP switch

Kick-Up-The-Butt! and Case

Mon, 02 Jun 2025 00:00:00 +0000

A reset cartridge for the Commodore 64 and Commodore VIC20 with pass-through and case.

BOM (THT)

1 x 6mm Tactile Swtich (ideally a tall one if you want to 3D print the case)
1 x 805-24P Connector (24pin C64 / VIC 20 User Port Connector)

Mount Winchester FL16

Mon, 02 Jun 2025 00:00:00 +0000

A full length 16bit ISA Hard Card for mounting and powering drives from an ISA slot

Features

Make use of those ISA slots by mounting up to 2 x 3.5" drives or 3 x 2.5" drives (or a combination)
Hard drives can be powered directly from the card, or from the power supply.
5 power points for attaching up to 5 power cables which can be either Molex or SATA
Power LED

BOM (THT)

1 x 330 Ohm Resistor
1 x 3mm LED
Up to 5 x Molex or SATA power connector cables (optional)

PCB Coffee Coaster

Mon, 02 Jun 2025 00:00:00 +0000

This is a novelty coffee coaster made out of PCB, with coffee and electronics related puns. It works out quite well because if you get it manufactured, the minimum quantity is usually about 5 for $5.

StickleBack + Case

Mon, 02 Jun 2025 00:00:00 +0000

The joystick interface is a clone of the ‘First Byte Digital Joystick Interface’ standard

Use normal 9-pin digital joysticks / joypads that follow the Atari standard (ie most home computers of the 80s and early 90s)
Joystick interface is a clone of the ‘First Byte Digital Joystick Interface’ and is compatible with games which natively support it such as Frak!, Hostages, Crack-Up, Rubble Trouble etc
Works with almost all Acorn Electron games, even keyboard only games as the software includes keyboard emulation and analogue joystick emulation support
Works with tape and disc based games
Easy to use in your BASIC programs
Includes an audio out connector so you can hook-up your Acorn Electron to an external amplified device (TV, speakers etc)
Power LED
Pass-through connector for additional expansions

BOM (THT)

1 x 5mm LED
1 x 330Ω Axial Resistor - ¼ watt (LED)
4 x 10KΩ Axial Resistor - ¼ watt
1 x 74LS138 16pin DIP
1 x 74LS367 16pin DIP
1 x 74LS30 14pin DIP
1 x 10uF Radial Electrolytic Capacitor
1 x 5-pin 3.5mm Audio Jack Socket TN/T/RN/R/S
1 x Male DE-9 Connector - right angled
1 x 50pin (2x25) Edge Connector
2 x 16pin DIP sockets (optional)
1 x 14pin DIP socket (optional)

XA1541 Active

Mon, 02 Jun 2025 00:00:00 +0000

XA1541 Active - Connect Commdore floppy drives such as the 1541 to the parallel port of the PC to read and write native Commodore disks, original circuit design is © Michael Klein and Nicolas Welte. Original XA1541 site

BOM (THT)

4 x 2N3904 transistors
4 x 4.7 KOhm resistors
1 x DB25 Male Edge Mount connector
1 x through hole DIN 45322 connector

XTra-RAM

Mon, 02 Jun 2025 00:00:00 +0000

512K RAM Expansion (8bit ISA) for XT class PCs and earlier with configurable banks

Features

512K RAM
8 x 64K banks
Each bank can be independently configured as:
- Low Address
- High Address
- Disabled

BOM (THT)

16 x 10 KOhm resistors
1 x 74LS245 20pin DIP
2 x 74LS157 16pin DIP
1 x 74LS151 16pin DIP
1 x AS6C4008-55PCN SRAM 32pin DIP
5 x 100nF Ceramic Capacitors
2 x 47uF Electrolytic Capacitors
1 x 10uF Electrolytic Capacitor
2 x 8-pole DIP switches

IC sockets optional

PCB on Ian's Projects

BoomBay 525 and Case

Features

Links

BOM (THT)

JACC64-16K and Case

Features

Links

BOM (THT)

JACC64-512K and Case

Features

Links

BOM (THT)

Kick-Up-The-Butt! and Case

Links

BOM (THT)

Mount Winchester FL16

Links

BOM (THT)

PCB Coffee Coaster

StickleBack + Case

Links

BOM (THT)

XA1541 Active

Links

BOM (THT)

XTra-RAM

Links

BOM (THT)